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I recommend not testing in fresh water because the surface tension is different, causing the bubles to combine, not giving you a good idea of what buble size you are actually producing.
I spent several weeks looking for a wood that would give me good bubles. I strated with basswood, but testing in fresh water gave me big bubbles. Went to oak, some tight pine, balsa, and the a couple more pieces of tighter bass until it dawned on me to run them in saltwater. Put one in my tank and was ****ed at myself to see millions of tiny little bubles..Luckly I do alot of wood work, so was out of my time more than anything.
BTW
All wooden diffusers sold in stores are marketed as "limewood". Lime wood = bass wood. I guess the British call it limewood, and to confuse the consumer, that is what it is sold as...
I would suggest looking for a tight smooth grained piece of bass wood, and use a fine toothed saw to get a nice clean, almost burnt cut.
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